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<div id="overview"><a href="../../../../../../../../../../apidocs/org/azeckoski/reflectutils/ClassLoaderUtils.html">View Javadoc</a></div><pre>

<a name="1" href="#1">1</a>   <em>/**<em>*</em></em>
<a name="2" href="#2">2</a>   <em> * $Id: ClassLoaderUtils.html 10 2008-10-01 10:56:15Z azeckoski $</em>
<a name="3" href="#3">3</a>   <em> * $URL: http://reflectutils.googlecode.com/svn/maven/site/xref/org/azeckoski/reflectutils/ClassLoaderUtils.html $</em>
<a name="4" href="#4">4</a>   <em> * ClassLoaderUtils.java - genericdao - May 8, 2008 5:39:34 PM - azeckoski</em>
<a name="5" href="#5">5</a>   <em> **************************************************************************</em>
<a name="6" href="#6">6</a>   <em> * Copyright (c) 2008 Aaron Zeckoski</em>
<a name="7" href="#7">7</a>   <em> * Licensed under the Apache License, Version 2.0</em>
<a name="8" href="#8">8</a>   <em> * </em>
<a name="9" href="#9">9</a>   <em> * A copy of the Apache License has been included in this </em>
<a name="10" href="#10">10</a>  <em> * distribution and is available at: <a href="http://www.apache.org/licenses/LICENSE-2.0.txt" target="alexandria_uri">http://www.apache.org/licenses/LICENSE-2.0.txt</a></em>
<a name="11" href="#11">11</a>  <em> *</em>
<a name="12" href="#12">12</a>  <em> * Aaron Zeckoski (azeckoski@gmail.com) (aaronz@vt.edu) (aaron@caret.cam.ac.uk)</em>
<a name="13" href="#13">13</a>  <em> */</em>
<a name="14" href="#14">14</a>  
<a name="15" href="#15">15</a>  <strong>package</strong> org.azeckoski.reflectutils;
<a name="16" href="#16">16</a>  
<a name="17" href="#17">17</a>  <strong>import</strong> java.util.ArrayList;
<a name="18" href="#18">18</a>  <strong>import</strong> java.util.Collection;
<a name="19" href="#19">19</a>  <strong>import</strong> java.util.List;
<a name="20" href="#20">20</a>  
<a name="21" href="#21">21</a>  <em>/**<em>*</em></em>
<a name="22" href="#22">22</a>  <em> * Utilities to help with operations that deal in {@link ClassLoader} and {@link Class}</em>
<a name="23" href="#23">23</a>  <em> * </em>
<a name="24" href="#24">24</a>  <em> * @author Aaron Zeckoski (azeckoski@gmail.com)</em>
<a name="25" href="#25">25</a>  <em> */</em>
<a name="26" href="#26">26</a>  <strong>public</strong> <strong>class</strong> <a href="../../../org/azeckoski/reflectutils/ClassLoaderUtils.html">ClassLoaderUtils</a> {
<a name="27" href="#27">27</a>  
<a name="28" href="#28">28</a>      <em>/**<em>*</em></em>
<a name="29" href="#29">29</a>  <em>     * @param className a fully qualified class name (e.g. org.dspace.MyClass)</em>
<a name="30" href="#30">30</a>  <em>     * @return the Class if it can be found in the context or current {@link ClassLoader} OR null if no class can be found</em>
<a name="31" href="#31">31</a>  <em>     */</em>
<a name="32" href="#32">32</a>      <strong>public</strong> <strong>static</strong> Class&lt;?> getClassFromString(String className) {
<a name="33" href="#33">33</a>          Class&lt;?> c = <strong>null</strong>;
<a name="34" href="#34">34</a>          <strong>try</strong> {
<a name="35" href="#35">35</a>              ClassLoader cl = getCurrentClassLoader();
<a name="36" href="#36">36</a>              c = Class.forName(className, <strong>true</strong>, cl);
<a name="37" href="#37">37</a>          } <strong>catch</strong> (ClassNotFoundException e) {
<a name="38" href="#38">38</a>              <strong>try</strong> {
<a name="39" href="#39">39</a>                  ClassLoader cl = ClassLoaderUtils.<strong>class</strong>.getClassLoader();
<a name="40" href="#40">40</a>                  c = Class.forName(className, <strong>true</strong>, cl);
<a name="41" href="#41">41</a>              } <strong>catch</strong> (ClassNotFoundException e1) {
<a name="42" href="#42">42</a>                  <strong>try</strong> {
<a name="43" href="#43">43</a>                      c = Class.forName(className);
<a name="44" href="#44">44</a>                  } <strong>catch</strong> (ClassNotFoundException e2) {
<a name="45" href="#45">45</a>                      c = <strong>null</strong>;
<a name="46" href="#46">46</a>                  }
<a name="47" href="#47">47</a>              }
<a name="48" href="#48">48</a>          }
<a name="49" href="#49">49</a>          <strong>return</strong> c;
<a name="50" href="#50">50</a>      }
<a name="51" href="#51">51</a>  
<a name="52" href="#52">52</a>      <em>/**<em>*</em></em>
<a name="53" href="#53">53</a>  <em>     * @return the current context {@link ClassLoader} or the nearest thing that can be found</em>
<a name="54" href="#54">54</a>  <em>     */</em>
<a name="55" href="#55">55</a>      <strong>public</strong> <strong>static</strong> ClassLoader getCurrentClassLoader() {
<a name="56" href="#56">56</a>          ClassLoader cl = Thread.currentThread().getContextClassLoader();
<a name="57" href="#57">57</a>          <strong>if</strong> (cl == <strong>null</strong>) {
<a name="58" href="#58">58</a>              cl = ClassLoaderUtils.<strong>class</strong>.getClassLoader();
<a name="59" href="#59">59</a>          }
<a name="60" href="#60">60</a>          <strong>return</strong> cl;
<a name="61" href="#61">61</a>      }
<a name="62" href="#62">62</a>  
<a name="63" href="#63">63</a>  
<a name="64" href="#64">64</a>      <em>/**<em>*</em></em>
<a name="65" href="#65">65</a>  <em>     * Returns a list of all superclasses and implemented interfaces by the supplied class,</em>
<a name="66" href="#66">66</a>  <em>     * recursively to the base, up to but excluding Object.class. These will be listed in order from</em>
<a name="67" href="#67">67</a>  <em>     * the supplied class, all concrete superclasses in ascending order, and then finally all</em>
<a name="68" href="#68">68</a>  <em>     * interfaces in recursive ascending order.&lt;br/></em>
<a name="69" href="#69">69</a>  <em>     * This will include duplicates if any superclasses implement the same classes </em>
<a name="70" href="#70">70</a>  <em>     * </em>
<a name="71" href="#71">71</a>  <em>     * Taken from PonderUtilCore around version 1.2.2</em>
<a name="72" href="#72">72</a>  <em>     *  - Antranig Basman (antranig@caret.cam.ac.uk)</em>
<a name="73" href="#73">73</a>  <em>     */</em>
<a name="74" href="#74">74</a>      <strong>public</strong> <strong>static</strong> List&lt;Class&lt;?>> getSuperclasses(Class&lt;?> clazz) {
<a name="75" href="#75">75</a>          List&lt;Class&lt;?>> accumulate = <strong>new</strong> ArrayList&lt;Class&lt;?>>();
<a name="76" href="#76">76</a>          <strong>while</strong> (clazz != Object.<strong>class</strong>) {
<a name="77" href="#77">77</a>              accumulate.add(clazz);
<a name="78" href="#78">78</a>              clazz = clazz.getSuperclass();
<a name="79" href="#79">79</a>          }
<a name="80" href="#80">80</a>          <strong>int</strong> supers = accumulate.size();
<a name="81" href="#81">81</a>          <strong>for</strong> (<strong>int</strong> i = 0; i &lt; supers; ++i) {
<a name="82" href="#82">82</a>              appendSuperclasses(accumulate.get(i), accumulate);
<a name="83" href="#83">83</a>          }
<a name="84" href="#84">84</a>          <strong>return</strong> accumulate;
<a name="85" href="#85">85</a>      }
<a name="86" href="#86">86</a>  
<a name="87" href="#87">87</a>      <em>/**<em>*</em></em>
<a name="88" href="#88">88</a>  <em>     * Taken from PonderUtilCore around version 1.2.2</em>
<a name="89" href="#89">89</a>  <em>     *  - Antranig Basman (antranig@caret.cam.ac.uk)</em>
<a name="90" href="#90">90</a>  <em>     */</em>
<a name="91" href="#91">91</a>      <strong>private</strong> <strong>static</strong> <strong>void</strong> appendSuperclasses(Class&lt;?> clazz, List&lt;Class&lt;?>> accrete) {
<a name="92" href="#92">92</a>          Class&lt;?>[] interfaces = clazz.getInterfaces();
<a name="93" href="#93">93</a>          <strong>for</strong> (<strong>int</strong> i = 0; i &lt; <strong>int</strong>erfaces.length; ++i) {
<a name="94" href="#94">94</a>              accrete.add(interfaces[i]);
<a name="95" href="#95">95</a>          }
<a name="96" href="#96">96</a>          <strong>for</strong> (<strong>int</strong> i = 0; i &lt; <strong>int</strong>erfaces.length; ++i) {
<a name="97" href="#97">97</a>              appendSuperclasses(interfaces[i], accrete);
<a name="98" href="#98">98</a>          }
<a name="99" href="#99">99</a>      }
<a name="100" href="#100">100</a> 
<a name="101" href="#101">101</a> 
<a name="102" href="#102">102</a>     <em>/**<em>*</em></em>
<a name="103" href="#103">103</a> <em>     * Finds a class type that is in the containing collection,</em>
<a name="104" href="#104">104</a> <em>     * will always return something (failsafe to Object.class)</em>
<a name="105" href="#105">105</a> <em>     * @param collection any collection (List, Set, etc.)</em>
<a name="106" href="#106">106</a> <em>     * @return the class type contained in this collecion</em>
<a name="107" href="#107">107</a> <em>     */</em>
<a name="108" href="#108">108</a>     @SuppressWarnings(<span class="string">"unchecked"</span>)
<a name="109" href="#109">109</a>     <strong>public</strong> <strong>static</strong> Class&lt;?> getClassFromCollection(Collection collection) {
<a name="110" href="#110">110</a>         <em class="comment">// try to get the type of entities out of this collection</em>
<a name="111" href="#111">111</a>         Class&lt;?> c = Object.<strong>class</strong>;
<a name="112" href="#112">112</a>         <strong>if</strong> (collection != <strong>null</strong>) {
<a name="113" href="#113">113</a>             <strong>if</strong> (! collection.isEmpty()) {
<a name="114" href="#114">114</a>                 c = collection.iterator().next().getClass();
<a name="115" href="#115">115</a>             } <strong>else</strong> {
<a name="116" href="#116">116</a>                 <em class="comment">// this always gets Object.class -AZ</em>
<a name="117" href="#117">117</a>                 <em class="comment">//c = collection.toArray().getClass().getComponentType();</em>
<a name="118" href="#118">118</a>                 c = Object.<strong>class</strong>;
<a name="119" href="#119">119</a>             }
<a name="120" href="#120">120</a>         }
<a name="121" href="#121">121</a>         <strong>return</strong> c;
<a name="122" href="#122">122</a>     }
<a name="123" href="#123">123</a> 
<a name="124" href="#124">124</a> }
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